It helps to keep a stash of small bills in your wallet for cab drivers, hotel porters and bar staff.

ECONOMIST: Business travel

"Square Wallet gives Starbucks customers a way to discover small businesses in their neighborhood, " said William Henderson, Square Wallet director.

ENGADGET: Starbucks begins offering Square Wallet purchases from today

Right now we're going to get the big picture on inflation and also the small picture, or a smaller picture anyway, what it means to your wallet.

NPR: Doing the Math on Inflation Figures